Multi-threaded alternating execution

package com.xsz.demo;import java.util.concurrent.locks.condition;import  java.util.concurrent.locks.lock;import java.util.concurrent.locks.reentrantlock;/** *  Two threads alternately execute the line  *  @author  cwqi */public class AdvanceMutiThread {public static  Void main (String[] args)  {final ThreadTest5 threadTest5 = new  ThreadTest5 (); Final int count = 5;new thread (new runnable ()  {@ Overridepublic void run ()  {for  (int i = 0; i < count;  i++)  {threadtest5.addmethod ();}}). Start (); New thread (new runnable ()  {@Overridepublic  void run ()  {for  (int  i = 0; i < count; i++)  {threadtest5.subtractmethod ();}}). Start ();}} Class threadtest5 {private lock lock = new reentrantlock ();p Rivate int  cons = 0;int flag = 0; Condition con1 = lock.newcondition (); Condition con2 = lock.newcondition ();p Ublic void addmethod ()  { //  Execute plus 1lock.lock ();try {while  (flag % 2 != 0) con1.await (); System.out.println ("thread a:  "  +  (++cons)); Flag++;con2.signal ();}  catch  (exception e)  {e.printstacktrace ();}  finally {lock.unlock ();}} Public void subtractmethod ()  { //  perform minus 1lock.lock ();try {while  (flag %  2 == 0) con2.await (); System.out.println ("thread b:  "  +  (--cons)); Flag++;con1.signal ();}  catch  (exception e)  {e.printstacktrace ();}  finally {lock.unlock ();}}}

Multi-threaded alternating execution